If Mary was sinless and could not die, then SHE could have offered redemption for mankind. Jesus didn't need to come and die because there would have been some other way of salvation.
And if God did it for Mary, He could certainly have done it for the rest of the human race as well.
Why didn't He/ Why inflict such torment and misery and suffering on humanity when with a wave of His spiritual wand, He could have created us all sinless like Mary?
“If Mary was sinless and could not die, then SHE could have offered redemption for mankind. Jesus didn’t need to come and die because there would have been some other way of salvation.”
One, Mary was only sinless because of Christ.
Two, Mary isn’t God. Only God can save us. This is why Christ, who was fully God and fully Man could redeem us.